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Technical information leak

Description​

It is possible to obtain technical information such as:

  • System component versions (HTTP headers, service banner, etc.)
  • Specific information about the configuration of server components (php.ini, web.config)

Impact​

Obtain technical information to create new attack vectors.

Recommendation​

  • Eliminate the services banner with information leakage.
  • Verify that HTTP headers do not display any name or version.

Threat​

Anonymous attacker from the Internet.

Expected Remediation Time​

⌚ 60 minutes.

Score​

Default score using CVSS 3.1. It may change depending on the context of the vulnerability.

Base​

  • Attack vector: N
  • Attack complexity: L
  • Privileges required: N
  • User interaction: N
  • Scope: U
  • Confidentiality: L
  • Integrity: N
  • Availability: N

Temporal​

  • Exploit code madurity: U
  • Remediation level: U
  • Report confidence: C

Result​

  • Vector string: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:U/RL:U/RC:C
  • Score:
    • Base: 5.3
    • Temporal: 4.9
  • Severity:
    • Base: Medium
    • Temporal: Medium

Code Examples​

Compliant code​

Avoid the use of those functions in a production environment

import org.apache.logging.log4j.Logger;
import org.apache.logging.log4j.LogManager;

public class Test {
  private static Logger logger = LogManager.getLogger(Log4jExample.class);

  public static void main(String[ ] args) {
    try {
      int[] myNumbers = {1, 2, 3};
      System.out.println(myNumbers[10]);
    } catch (IndexException e) {
      if (e.toString() == "Error"){
        System.out.println("Error");
      }
    }
  }
}

Non compliant code​

The system potentially exposes technical information through the use of functions like printStackTrace

import org.apache.logging.log4j.Logger;
import org.apache.logging.log4j.LogManager;

public class Test {
  private static Logger logger = LogManager.getLogger(Log4jExample.class);

  public static void main(String[ ] args) {
    try {
      int[] myNumbers = {1, 2, 3};
      System.out.println(myNumbers[10]);
    } catch (IndexException e) {
      if (e.toString() == "Error"){
        System.out.println("Error");
      }
      e.printStackTrace();
    }
  }
}

Requirements​

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